Preheat the oven at 220 degrees.
Butter an oven form approximately 20 cm x 30 cm
In a frying pan pour the left over butter and fry he bacon.
In a bowl mix half of the milk with the flour and the salt.
Add the rest of the milk and mix well.
Pour the batter in the oven form.
Pour the bacon in the form as well.
Place in the oven for 20 minutes or until the surface becomes lightly brown.
Take out and serve warm together with lingonberry jam.